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Finding net external force

  1. Oct 4, 2005 #1
    Mass of 2.6kg lies on a frictionless table, pulled by another mass of 4.1kg under the influence of gravity (mass 4.1kg is hanging off the edge of the table). The acceleration due to gravity is 9.8m/s^2. What is the magnitude of the net external force (gravitational) acting on the two masses?

    I thought I'd get the answer by using F=g(m1)(m2), but that was wrong. I don't know where to go from here. :confused:
  2. jcsd
  3. Oct 4, 2005 #2
    Try a diagram first, develop and equation for each of the masses. Solve for Tension on the second mass and plug it into first equation. From there solve for g.
  4. Oct 4, 2005 #3
    I figured out that the tension of the hanging force is 40.18 and the tension of the rope is 15.592...where do I go from here?
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